<!doctype html>
<!--
Copyright 2018 The Go Authors. All rights reserved.
Use of this source code is governed by a BSD-style
license that can be found in the LICENSE file.
-->
<html>

<head>
    <meta charset="utf-8">
    <title>Go wasm</title>
</head>

<body>
<!--
Add the following polyfill for Microsoft Edge 17/18 support:
<script src="https://cdn.jsdelivr.net/npm/text-encoding@0.7.0/lib/encoding.min.js"></script>
(see https://caniuse.com/#feat=textencoder)
-->
<script src="wasm_exec.js"></script>
<script>
    if (!WebAssembly.instantiateStreaming) { // polyfill
        WebAssembly.instantiateStreaming = async (resp, importObject) => {
            const source = await (await resp).arrayBuffer();
            return await WebAssembly.instantiate(source, importObject);
        };
    }

    const go = new Go();
    let mod, inst;
    WebAssembly.instantiateStreaming(fetch("test.wasm"), go.importObject).then((result) => {
        mod = result.module;
        inst = result.instance;
        document.getElementById("runButton").disabled = false;
    }).catch((err) => {
        console.error(err);
    });

    async function run() {
        console.clear();
        await go.run(inst);
        inst = await WebAssembly.instantiate(mod, go.importObject); // reset instance
    }
</script>

<button onClick="run();" id="runButton" disabled>Run</button>
</body>

</html>